package com.hsoft.zhxy.common.util;

import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * 保留用户会话，以方便在业务代码中调用
 *
 * @author menglingwei
 *
 */
@Component
public class HttpRequestLocal {

    public HttpRequestLocal() {

    }

    private static final ThreadLocal<HttpServletRequest> requests =
            new ThreadLocal<HttpServletRequest>() {
                @Override
                protected HttpServletRequest initialValue() {
                    return null;
                }
            };

	/**
	 * 通过key获取request中存储的value
	 * @param attr
	 * @return
	 */
	public Object getRequestValue(String attr) {
        return requests.get().getAttribute(attr);
    }

	/**
	 * 获取本次请求的目的uri
	 * @return
	 */
	public String getRequestURI() {
        return requests.get().getRequestURI();
    }

	/**
	 * 获取本次请求者的IP
	 * @return
	 */
	public String getRequestIP() {
        return getIpAddr(requests.get());
    }

	public void set(HttpServletRequest request) {
        requests.set(request);
    }

    /**
     * 获取当前网络ip
     *
     * @param request
     * @return
     */
    public String getIpAddr(HttpServletRequest request) {
        String ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                //根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }

	/**
	 * 通过key获取session中的value
	 * @param attr
	 * @return
	 */
	public Object getSessionValue(String attr) {
		return requests.get().getSession().getAttribute(attr);
	}

	/**
	 * 通过key设置session中的值
	 * @param attr
	 * @param obj
	 */
	public void setSessionValue(String attr, Object obj) {
		requests.get().getSession().setAttribute(attr, obj);
	}

}